ICD-10 Code L02.821 – Furuncle of head [any part, except face] (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L02.821 – Furuncle of head [any part, except face]
What it is
L02.821 identifies a furuncle, or boil, on the head excluding the face. It refers to a localized bacterial infection of a hair follicle that produces a tender, pus-filled skin lesion.
Clinical signs
Typical findings include a painful, red, swollen nodule that may drain pus or form a central plug. Clinical features vary; refer to documentation if the record does not clearly describe the lesion location or type.
When to use this code
Use this code when documentation states a furuncle on the scalp, occiput, or other nonfacial head area. It fits a single boil documented as being on the head, not the face. If the note only says “skin infection,” check documentation for the precise site.
Do not use for
Do not use this code for facial boils, carbuncles, or abscesses at other body sites. If the lesion is not specifically on the head or the location is unclear, check documentation.
Coding tip
Verify that the chart distinguishes “head” from “face,” because that difference determines whether L02.821 applies.